[Java] ScrollPane wird nicht angezeigt?

private JFrame fFrame = new JFrame("frame");
private JTextArea taInput = new JTextArea();
private static final Dimension FRAME_SIZE = new Dimension(450, 500);
private static final Dimension TEXTFIELD_SIZE = new Dimension(400, 100);

private void initGui() {
 fFrame.setPreferredSize(FRAME_SIZE);
 fFrame.setLayout(new FlowLayout());
 fFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 
 fFrame.add(taInput);
 taInput.setPreferredSize(TEXTFIELD_SIZE);
 taInput.setEditable(true);
 taInput.setText(input);
 JScrollPane scrollPane = new JScrollPane(taInput);
 fFrame.add(scrollPane);

 fFrame.pack();
 fFrame.setVisible(true);
}